Genetic Background and Sex Significantly Influence Bone Response to Osteoporosis Drug PTH
A study in genetically diverse mice found that response to teriparatide (PTH), an anabolic osteoporosis treatment, varies substantially based on genetic strain and sex. Males and females showed different bone remodeling mechanisms, with some strains responding at the femur but not the spine. These findings suggest genetic and sex-specific factors could explain why patients respond differently to PTH therapy, supporting future personalized medicine approaches.
Researchers administered intermittent PTH to male and female mice from eight genetically diverse inbred strains over four weeks and measured bone changes using DXA, microCT, and mechanical testing. Response to PTH was highly dependent on both genetic strain and sex, with heritability estimates for PTH-induced changes in bone mineral density, cortical area, breaking strength, and trabecular bone volume ranging from moderate to high. The study revealed sex-specific mechanisms: males exhibited periosteal expansion (bone growth outward), while females showed endosteal remodeling (bone growth inward). These patterns mirror clinical observations where hip non-response to PTH is more common than spine non-response. The findings support using genetically diverse mouse models to identify specific genetic loci responsible for PTH responsiveness and suggest potential for developing personalized osteoporosis treatment strategies.
What's missing
The study's limitations regarding mouse model translatability to human populations are not explicitly discussed. Additionally, the mechanisms underlying why certain strains show site-specific responses (femur vs. spine) remain to be elucidated. The study does not address potential environmental or epigenetic factors that might modulate genetic effects on PTH response.
What different sources said
- bioRxivCenter
Bone response to intermittent parathyroid hormone (PTH) is both genetic and sex specific
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